Why should the ray emergeing from the glass block come out parallel to the incid

Question

Why should the ray emergeing from the glass block come out parallel to the incident ray?
As the angle of incidence increases in equal 10 degree intervals, does the angle of refraction also increase in equal intervals? for what angle of incidence is the angle of refraction a maximum? Determine from the relation ship n=sin i/ sin r the highest value that r can have in the glass.

How can the technique of this experiment be used to determine whether any two different colors of light such as red light and blue light, travel at the same speed in the glass?

Assuming that you have a thin-walled plastic rectangular container, describe a technique suitable for measuring the speed of light in water.

angle of incedence i 0 10 20 30 40 50 60 70 angle of refraction r 0 6 13 18 27 20 46 40 sin i 0 0.17 0.34 0.5 0.64 0.77 0.87 0.94 sin r 0 0.1 0.22 0.31 0.45 0.34 0.72 0.64

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